<template>
	<!-- 分页组件 -->
	<div :class="{ 'hidden': hidden }" class="pagination-container">
		<el-pagination :background="background" :current-page.sync="currentPage" :page-size.sync="pageSize" :layout="layout"
			:page-sizes="pageSizes" :pager-count="pagerCount" :total="total" v-bind="$attrs" @size-change="handleSizeChange"
			@current-change="handleCurrentChange" />
	</div>
</template>

<script>
import { scrollTo } from '@/utils/scroll-to'

export default {
	name: 'Pagination',
	props: {
		total: {
			required: true,
			type: Number
		},
		page: {
			type: Number,
			default: 1
		},
		limit: {
			type: Number,
			default: 20
		},
		pageSizes: {
			type: Array,
			default() {
				return [10, 20, 30, 50]
			}
		},
		// 移动端页码按钮的数量端默认值5
		pagerCount: {
			type: Number,
			default: document.body.clientWidth < 992 ? 5 : 7
		},
		layout: {
			type: String,
			default: 'total, sizes, prev, pager, next, jumper'
		},
		background: {
			type: Boolean,
			default: true
		},
		autoScroll: {
			type: Boolean,
			default: true
		},
		hidden: {
			type: Boolean,
			default: false
		}
	},
	data() {
		return {
		};
	},
	computed: {
		currentPage: {
			get() {
				return this.page
			},
			set(val) {
				this.$emit('update:page', val)
			}
		},
		pageSize: {
			get() {
				return this.limit
			},
			set(val) {
				this.$emit('update:limit', val)
			}
		}
	},
	methods: {
		handleSizeChange(val) {
			if (this.currentPage * val > this.total) {
				this.currentPage = 1
			}
			this.$emit('pagination', { page: this.currentPage, limit: val })
			if (this.autoScroll) {
				// 分页跳转时避免数据过多处于底部，自动滚动到页面顶部
				scrollTo(0, 800)
			}
		},
		handleCurrentChange(val) {
			this.$emit('pagination', { page: val, limit: this.pageSize })
			if (this.autoScroll) {
				scrollTo(0, 800)
			}
		}
	}
}
</script>

<style scoped>
.pagination-container {
	background: transparent;
	padding: 32px 16px;
	margin-left: 15px;
	margin-right: 15px;
}

.pagination-container.hidden {
	display: none;
}
</style>
